Chemistry question and answers for September 20, 2023
- Q How many grams of an acid, HA (FW 90.04,Ka=5.60x10-2) should be mixed with 5.00 g of itsconjugate base, A- (FW 176.22) to give a pH of 1.10 whendiluted to 200...
- Q what is the organ system involves the Gamma ( GT) liver functiontest
- Q A sample of a compound containing boron (B) and hydrogen (H)contains 1.152 g of B and 0.3222 g of H. The molar mass of thecompound is about 30 g. What...
- Q Which type of chemical equation or reaction takes the form ofAB+XY-->AY+XBA) CombustionB) SynthesisC) Single DisplacmentD) Double Displacment
- Q An empty 5.00-L flask is charged with 0.250 g of pure H2S(g), at25 ∘C.What is the initial pressure of H2S(g) in the flask?3.59*10^-2 atmIn addition to the H2S already present...
- Q A voltaic cell employs the following redox reaction:Sn2+(aq)+Mn(s)→Sn(s)+Mn2+(aq)Calculate the cell potential at 25 ∘C under each of the followingconditions.A) Standard conditionB) [Sn2+]= 1.64×10−2 M ; [Mn2+]= 2.25 MC) [Sn2+]= 2.25...
- Q A website promoting the use of alternative energy vehicles andhybrid technologies claims that, \\"A typical automobile in the USAuses about 500 gallons of gasoline every year, producing about 5tons of...
- Q Why does an exergonic reaction mean that the products have lowerfree energy than the reactants, rather than the other way around,where the reactants have lower free energy than the products?Because...
- Q Which of the following elements is a brittle solid and poorconductor of heat and electricity?A. NaB.MnC. SD.Pt
- Q Insoluble PbBr2(s) precipitates when solutions of Pb(NO3)2(aq)and NaBr(aq) are mixed.Pb(NO3)2(aq) + 2 NaBr(aq) → PbBr2(s) + 2 NaNO3(aq) ΔrH° = ?To measure the enthalpy change, 200. mL of 0.75 M...
- Q From the enthalpies of reaction H2(g)+F2(g)→2HF(g)ΔH=−537kJC(s)+2F2(g)→CF4(g)ΔH=−680kJ 2C(s)+2H2(g)→C2H4(g)ΔH=+52.3kJcalculate ΔH for the reaction of ethylene with F2:C2H4(g)+6F2(g)→2CF4(g)+4HF(g)
- Q If 1.5 moles of hexane ( ) combust to completion: 6 14 C H2.1 How many moles of CO2 would we have at the end of thereaction? [1]2.2 How many...
- Q NO OTHER DATA PROVIDED4. A give soil has a CEC of 12.50 cmol of charge per kg of soil.If 70%, 15%, 10% and 5% of the CECis occupied by Ca+2,...
- Q What are some real-life applications of substitution reactions(SN1 & SN2) and elimination reactions (E1 & E2)? Please bespecific and detail.
- Q Calculate E∘cell for each of the following balancedredox reactions. Are the reactions spontanous?A) 2Cu(s)+Mn2+(aq)→2Cu+(aq)+Mn(s)B) MnO2(s)+4H+(aq)+Zn(s)→Mn2+(aq)+2H2O(l)+Zn2+(aq)C) Cl2(g)+2F−(aq)→F2(g)+2Cl−(aq)
- Q 2CH4 + 4Cl2 = 2CHCL3 + 2HCL1) If 5.5 CH4 react with 27.4 g CL2 whatis the limiting reactant and what mass of HCl will form? (I canfind the LR...
- Q 1.A solution that contains 90 moles of water and 1 mole of MgCl2 willhave what partial pressure? The vapor pressure of pure water is17.5 mmHg.At standard temperature and pressure, water...
- Q explain how an anion-exchange resin can be used for absorptionand analysis of SO2 released by combustion.
- Q 1. A fossil is found to have a 14C level of 87.0% compared toliving organisms. How old is the fossil?(answer in years)2.Iodine-131 is a radioactive isotope. After 3.00 days, 77.2%...
- Q Determine the limiting reactant (LR) and themass (in g) of nitrogen that can be formed from50.0 g N2O4 and 45.0 g N2H4. Some possibly useful molar masses areas follows: N2O4...
- Q Show mechanism for 2 methylpropane free radical monobromination.Explain why pryon undergoes substitute reaction like benzenebut not addition reaction at the C=C bond
- Q 1a. When a solid dissolves in water, heat may be evolved orabsorbed. The heat of dissolution(dissolving) can be determined using a coffee cupcalorimeter.In the laboratory a general chemistry student finds...
- Q In this experiment, benzyl and dibenzyl ketone willproduce tetraphenylcyclopentadienone via aldol condensationreaction.1.) What is a condensation reaction? What is the smallmolecule lost in this reaction?2.) In this reaction, all the...
- Q 17.27 Briefly describe the two techniques that are used forgalvanic protection.
- Q 1) Build models for the PH3 andPH4+ species.How do you compare the angles of H - P - H bonds in bothspecies? If different, explain why.How do you compare your...
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